Electrical measuring instrument.



R. L, TRPLETT. ELECTRICAL 'IIEASUPNG STRMENT.

A APPLICATION FILED Nov. 2a, 1910.

@72?5311, Patented Slept. 9, i913.

'E man f ding ..1 0;? the' county of fallen mil ae of GLM, have mvented Ceram new and usp c g); device, such needke urangged 'fmw over a scale, the aci-:ien of which is i* ,nizmed by two magneag f, permanent m ,t and an @19mm-magnet The rdnm psstls .occupe by the magnets aect :zeilen oit-he indicating gevi, and, as wumfens are usually aSSfemble? ffhe rehzw posiions of H119, magnets Wl vagj* in dfarent nsyuments and i has been Custo pyovide nach nsrumam with a ml Susie, the prepslnon Gf which med vzuious tests und adjusmens and adw maezfly to the labor and ons? of nszumem', more paculmty Hz@ ma@ may he assembed m ined and predeporting' member or other source of electricity, which it is de-' shaped, having its poles arranged on the opposite sides ot' a central vertical line extending' parallel with the support-ing plate. 'lhis C-shaped magnet extends about the plate 5, the arms 9 and the lugs 10 and is supported in a plane extending transversely to the supporting member 5 and is rigidly' secnred to the lugs and the plate by suitable fastening devices, such as lips l2, extending 'from the upper and lower edges ot the lugs l() and compressed tightly on the uppei` and lower edges ot the adjacent portions of the magnet to clamp the saine lirmly in position.

The electro-magnet, which is indicated at 13,.,is arranged at substantially right angles to the plane of the permanent magnetand has that cud adjacentthc permanent magnet spaced away from said permanent magnet so that the electro-maguetl is entirely outside ot the permanent magnet. The plate 5 is also provided with suitable connecting `devices for supporting the electro-magnet in its properrelat-ion to the permanent magnet. In the present instance the upper 'portion of the-plate 5 is provided with portions extending at an angle thereto and forming lugs 14 and l5 between which the coil is mounted, these lugs being arranged in a line extending at substantially right angles to the plane of the permanent magnet. In the present instance the electro-'magnet is a double inagnet comprising a coil ot tine resistance wire, as indicated at 16, for use'in measuring voltage, andl a second coil, 17, of heavy conducting Wire for' use in measuring amperage.'

These coils aremounted upon a rod or stern 18 and each has one end connected with said rod and the other cnd extending downwardly through the C-shaped permanent magnet and connected with suitable contact posts i9 carried by the casing l. These contact posts may be of any `suitable character, but are here shown as binding posts of ordi- 'nary construction which may be. placed in direct contact With the terminal 'of' the cell sired to test, 'or may have connected theretoI a coiid-icto'r leading to a. source'of electrical supply. These binding posts extend thron gh the circumferential portion of the cylindrical casing, are insulated therefrom and have their inner ends exposed to Aform contact points with which the lead Wires from the two windings of the electro-magnet are connected. This connection ispreferably made by bringing the lead Wire in contact with the end of the binding post and soldering the same thereto, thereby avoiding any possibility ot accidental displacement of the lead Wire and the breaking ot the circuit` The manner of making this connection is. however, optional. lt Will be noted that the lead Wires extend 'through the space Within the permanent magnet Without comingin contact therewith and, therefore, it is Lof/2,531

unnecessary to provide any additional or special insulation tor these lead wires.

rihe electro-magnet 125 may be mounted on the fastening devices 14 and 1:3 in an;` suitable manner. As here shown the rod or stein i8 projects above and below the respective ends oil the magnet. 'lhc upper connecting device or lug l-l is provided with an aperture through which the adjacent end ot the rod is' inserted and the lower connecting device or lug l5 is provided with'a slot adapted to receive the adjacent end of the rod 1S. The positions ot' the. two connecting devices with relation to the length of the magnet are such that the magnet must be sprung into positionA by torce and the resiliency oi the connecting devices will then retain the magnet in position. rl`he rod 'iS extends through the circumferential nali ot' the'ca'sing l and has screw-threaded thereon a nut 20 by means ot' which the supporting plate and the several active parts carried thereby are'firmly secured Within the casing. The end of the rod extends above the nut 20 and 'forms a contact pin to receive a socket 21 of a flexible conductor 22 adapted to be connected with one terminal ot the source ot' The indicating device, which cooperates- With the scale 7 and which is controlled by the two magnets, comprises a Vane 23 which preferably consists of an elongated plate of sott iron mounted upon a pintle 24, one end of which is y. Lounted in the plate 5, preferably-between the arms. 9, and the other end of which is mounted in a supporting lug To form this su por-tin lug the plate 5 is preferably provided witi a downwardly extending finger which is'bent outwardly and then upwardly, as indicated in,tl iedrawings. A needle 26 is connected with the vane Q3 and moves therewith when the latter is moved about its axis. This needle extends through an opening 27' inthe plate 5 and upward in front of the plate to a point near the scale 7, across which it travels when the vane is actuated. A counterweight 28 isl also connected with the vane. This vane is arranged Within the field of the permanent magnet and extends substantially parallel with the lines ot force passing between the two poles.l When neither et the windings of the electro-magnet is energized the vane Vwill extend in a line substantially parallel with the plane of the magnet. When either" coil of the electro-magnet is energized the electro-magnet will attract one. pole ot the permanent magnet and repel the other pole Hierauf? Chus dei@ A he van@ 'm mme. www iti; axis t.

neede mms?, Vthe SCM@ T. @n

two binding 903:5; 19. ne i.,

which Cates the binding Dos mth da@ 5m wmdmg of 'd1/4 eecw-nmgmt 1 ing 0% '5- e when this p @azi on @ha phi@ when m 'ha that and adjacentb'e gunned.. f; "'f

is no?,

pm' the Ch. .Tauber occupy a szm magneis, of a s1 im; f

n siqvporing 'plaie coinprisn seid measuring instrument,

iti. plurality of magnele, und an indieainp; device controlled oy said magnets, of a eingie sunporiing memier, and connecting devices formed integral Avvn'o. 'said supporting member td secure said magnets in predetermined' positions thereon. in an electrical measuring instrument, the combination, with a plurality of magnes, and an indicating device Controlled by said magnets, of a supporting plaie of sheet melal having lugs effginck therefrom ioiining connecting devices io engage 'the respective magnets and secure the saine in predetermined positions `biiereon.

6. In an electrieai measuring inernnient, the combination, with 4'plurality of inagnef's, and an indicating device con trolled by said magnets, of a snppofting plate of sheet metal having lugs srnck therefrom forming connecting devices toengage the respective magnets and'seid indiealning device, and support said magnets in predeierinined positions ielaiively to Said indicating device.

7. n an electrical measuring insl'runient, the combination, vv'ife'n a plurality' of neis, and an indicating device controlled by seid magnets and Comprising a needle, of a snpporzing plaie having,` a Sonie on the fron ide iheieoi', having lugs piojecting from 'me rear side iiereoI to support seid magnes in `'nedeiermined positions relatively one tov ille other and having another lug to support said indicating device Ain a predetermined position relatively to said magnet. and said scale, said plae'liaving an opening 'through iviiioli said needie exiends. 4 i

3.y in an electrical measuring instrument, the combination, with a permanent magnet', en electro-magnet, andan indicating device eonrolied by said magnets, of a supporting plaie having lugs near the oppoeiie edges thereof to support said perinanent magnet and having o'fher lugs arranged in line cxending substantially at right angles io the' line of tl1erst-menfinned lugs and adapted io support Suid electro-magnet.

9. in an eieericai meas upper por-Mon having parli; nriied at an angle thereto to form ings, a reduced portion extenoing downward iroin said upper portion, and laterally extending carried by said reduced poeion lim Foei? ends turned angies thereto 'to Ioiin 1 e dlgs.

revenez.

i0. ln en electrical measuring instrument, a supporting member, permanent magnet mounted on seid supporting meniber in a piane extending iransversely thereto,'an electro-magnet mounted on said suppor'iing Ineiioer and having iis axis an ranged at substantially righi. angles to the plane of said permanent magnet, and an indicating vdevice mounted on said supporting member and eoniroiled ley said magnets.

l. n an eieciricai measuring 'inserte meni, a plate carrying a scale, a @I5-shaped magnet supported on said plaie in a piane extending; transversely thereto, an electromagnet supported on said plate 'with its axis arranged at substantially riglit angles to the plane of said C-shaped magnet and having that end near said magnetA 'spaced away thei'efiom.

l2. n an eieotrieal nieasnying instrument, e casing', a snpporung member mounted `efiliin Said casing, a permanent magneteaziried by Said supporting niembe'r, en eleetio-magnet eeriied by Said snppoi'iing member and having a siem which exiends through the Wall of said casing. and means for securing said stein to said easing.

13. En an electricel, measuring insererne'm, a easing, e supporting member ionnied within Asaid easing, a. permanent inepfnei; carried by said snpp'oring member, en eiecro-mngnet carried by seid enp-v porting niembenand neming,- e rod eleotricaily connected thereto and exending lnongh the wail oi said casing, a' nui, mounted/Jn said rod to secure the same to said casing, said rod extending beyond said nut to provide a coni-aci. point for connec' tion with a source of electrical supply.

l le. in an elecirieei. measuring instrin ment, a casing, e Supporting; ginie mounted in said easing, and having connecting lugs, a pei'nianent magnet inoonted'on said supporing plaie, an eleeroniagnetf having e siem supporting it and ,eleetrieaily conneced thereto', said stern eiending through one of said lugs and lthrough. and beyond the wall of seid casing, and means foi.' securing said stein to seid casing, Whereloj' seid stein serves to' eonneeteaid electroniagnet to Said support-ing pia'e to s'ree'ure said supporing plate to said casing and provides an external con'saet point directly i connected 'with lie winding oi said electroinfsrninent," n. sector-like l5. ln an eiecrieai measuring insinument a easing having a sight opening", a ignite of glass extending across said sight opening, a suppoi'ing plate mounted Williin Said easing, a plurality omagi'ies oariied by said supporting plaie, cushioning devices arranged between said supporting pinto and said glass, and means for Secuf-` 5 glass to close said opening, a supporting ingv said .supporting plate Within said arranged between another portion of said casmg.l *A A 16. In an electrea measuring nstru- .In testimony whereof, l ax my signument, a casing having a sight opening, a ture in presence of tWO Wi'IlGSSeS.

' RAY L. TRIPLETT.

platemunted within said casing, a spring, Vtnesses: arranged between one portion of said snp HENRY'L. ROMEY, 'porting pate and said glass, and a 'Cmhon ALBERT BEYRATH.

supporting plate and said. glass. 10 

